So it looks like I can SDC on my UA flts with CO flt numbers for an earlier flt and I can also change the stopover city. As I would like to go LAS-EWR-BWI instead of the current routing I have I would imagine that I would have to do this with a phone agent as I think the SDC via CO.com is only on the same exact routing or am I wrong? I have done lots of SDC but they have always been on non-stops and always appeared as choices for earlier flts to change to.

Also, I will be CO Plat at the time. If my DH and I are on the same PNR would there be no fee for him as he would be viewed as a Plat also since he is on my record?